Solution:

When you select the Start Instance After Install check box in any of
the SRA screens during installation, the configurator fails to start the portal
instance after installation and the Sun Java System installer displays an
error message about the configuration failure.

Check the installer logs to verify whether the configuration or the
start of the portal instance failed. If the instance failed to start, then
the installation and configuration of Sun Java System is correct. Now, use
the psadmin command to start the instance manually.

Note –

This incorrect display of error message is fixed in the Sun Java
System 5 Portal Server SRA 7.1 release.